The compensatory pause after the PVC is slightly longer than the junctional escape interval and allows the junctional rhythm to escape for 5 beats. During this period, the P waves from the sinus ...

The unusual wide QRS complex, tachycardic rhythm that changes morphology and axis within a few beats (see V1 rhythm strip at that bottom) is characteristic of polymorphic (meaning many shapes ...

1. Normal sinus rhythm 2. Premature ventricular contraction 3. Atrioventricular nodal reentry tachycardia (AVNRT) Note the premature ventricular contraction (PVC) that triggers the AVNRT in this ECG.

Figure 1 shows rhythm strips of leads I, II, and V1. What is happening in the middle of the strips following a premature ventricular complex (PVC ...